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Commitments and Contingencies - Additional Information (Detail) (USD $) | 6 Months Ended |  | 0 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Jul. 15, 2010 Schwab Plaintiff | Oct. 15, 2010 Minimum FHLB Chicago Plaintiff | Jun. 30, 2014 Maximum | Jun. 30, 2013 Maximum | Jun. 30, 2014 Sequoia FHLB Seattle Residential | Jun. 30, 2014 Sequoia Schwab Residential | Jun. 30, 2014 Sequoia FHLB Chicago Residential | Jun. 30, 2014 Sequoia FHLB Chicago First Notice Residential | Jun. 30, 2014 Sequoia FHLB Chicago Second Notice Residential
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Future lease commitments with expiration date | $ 14,411,000 |  |  |  |  |  |  |  |  |  |
Operating lease expiration dates |  |  |  |  | 2021 |  |  |  |  |  |
Operating lease expense | 1,000,000 |  |  |  |  | 1,000,000 |  |  |  |  |
Residential repurchase reserve | 2,477,000 | 1,771,000 |  |  |  |  |  |  |  |  |
Statutory interest rate per annum |  |  |  |  |  |  | 8.00% |  | 10.00% |  |
Original principal amount of securities |  |  |  |  |  |  | 133,000,000 | 14,800,000 |  | 105,000,000 | 379,000,000
Debt instrument principal payment amount |  |  |  |  |  |  | 115,300,000 |  |  |  |
Debt instrument interest payment amount |  |  |  |  |  |  | 11,000,000 |  |  |  |
Number of other named defendants along with SRF |  |  | 26 | 45 |  |  |  |  |  |  |
Principal balance of securities |  |  |  |  |  |  |  | 12,800,000 |  | 73,600,000 | 263,700,000
Debt instrument interest amount |  |  |  |  |  |  |  | 1,300,000 |  | 24,600,000 | 83,000,000
Aggregate amount of loss contingency reserves | $ 12,000,000 | $ 12,000,000 |  |  |  |  |  |  |  |  |

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